摘要
用供氮率平均值计算氮肥施用量误差太大，按不同土壤类型、不同肥力分级选用参数，将极大的提高氮肥施用量的准确度。不论高肥区和低肥区，对氮素化肥的依存率都高于水稻，且中低肥力区增产效益明显高于高肥力区，重视增加中低产土壤氮肥的投入，是促进油菜大面积平衡增产的关键。
The calculation of the
amount of nitrogenotis fertilizer application by the mean value ofsoil nitrogen supply rate has
too large errors. It greatly improves the accuracy of the amountto choose the values of
paramenters according to different soil types and fertility degrees. Nomatter in high or low
fertility soil,rape depends more on chemical nitrogenous fertilizer thanrice. And the effect of
nitrogenousfertilizer on the output increase in the middle and low fer-tility soil is markedly
larger than in the high fertility soil.So it is the key to the increase ofrape product in large areas
to pay great attention to increasing the amount of nitrogenous fer-tilizer application in the
middle and low fertility soil.
出处
《江西农业大学学报》
CAS
CSCD
1994年第1期20-24,共5页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家自然科学基金
关键词
油菜
施肥
配方
土壤供氮量
rape
optimized fertilization
soil testing and fertilizer
recomnlendation
pararnenters
